#include using namespace std; using VS = vector; using LL = long long; using VI = vector; using VVI = vector; using PII = pair; using PLL = pair; using VL = vector; using VVL = vector; #define ALL(a) begin((a)),end((a)) #define RALL(a) (a).rbegin(), (a).rend() #define SZ(a) int((a).size()) #define SORT(c) sort(ALL((c))) #define RSORT(c) sort(RALL((c))) #define UNIQ(c) (c).erase(unique(ALL((c))), end((c))) #define FOR(i, s, e) for (int(i) = (s); (i) < (e); (i)++) #define FORR(i, s, e) for (int(i) = (s); (i) > (e); (i)--) #define debug(x) cerr << #x << ": " << x << endl const int INF = 1e9; const LL LINF = 1e16; const LL MOD = 1000000007; const double PI = acos(-1.0); int DX[8] = { 0, 0, 1, -1, 1, 1, -1, -1 }; int DY[8] = { 1, -1, 0, 0, 1, -1, 1, -1 }; /* ----- 2018/05/05 Problem: yukicoder 152 / Link: http://yukicoder.me/problems/no/152 ----- */ /* ------問題------ -----問題ここまで----- */ /* -----解説等----- m,nが互いに素 m > n m-nは奇数 ----解説ここまで---- */ LL ans = 0LL; int main() { cin.tie(0); ios_base::sync_with_stdio(false); int L; cin >> L; for (int m = 2; 2 * m*m < L / 4; m++) { for (int n = (m % 2) + 1; n < m; n += 2) { if (2 * m*(m + n) <= L / 4 && __gcd(m, n) == 1) { ans++; } } } cout << ans << "\n"; return 0; }